大梁带铺放设备概念设计

论述了飞机上大梁带铺放机构的工作原理及设计方法.采用集成化设计概念,将铺放机的放料、除膜、张力控制、施压、剪切等必要装置集中组成铺放头机构;同时吸收缠绕技术中在线固化的技术,提出了逐层铺放,一步到位的理念,通过840D控制铺放头按规划的轨迹运动以实现精确铺层,提高产品质量.     

网格筋结构纤维铺放头的设计与分析

针对目前网格筋纤维铺放技术的不足,设计出了一种多功能纤维铺放头,它能根据所铺放网格状芯模槽的厚度和深度不同,实时改变伸出压辊机构压辊头宽度和长度,从而避免了因网格筋交叉处纤维束的重复铺放而引起应力集中问题,使碳纤维复合材料在铺放过程中不离缝、不重叠,提高了铺放效率,同时也减少了材料的浪费。将SolidWorks中建好的三维模型导入ADAMS中,对铺放头整体机构进行仿真分析,阐述了铺放头内部各机构的衔接运动以及铺放原理,验证了设计的可实施性。     

航空用预浸纤维带铺放装备设计

论述了航空用预浸纤维带铺放机构的工作原理及设计方法.采用集成化设计概念,将铺放杌的放料、除膜、张力控制、施压、剪切等必要装置集中组成铺放头机构;提出了铺层规划理念,通过840D控制铺放头按规划的轨迹运动以实现铺层;采用位置环、速度环、电流环等控制,完成对伺服电机的位置、速度、电流的调节作用,实现了铺放头的精确定位.     

纤维铺放头机构的研究

纤维增强复合材料(FRP)铺放成型技术是在手工迭层铺放和纤维缠绕工艺的基础上发展起来的一种机械化、自动化成型工艺.在纤维铺放成型技术中,主要采用铺放头机构来实现铺放功能.该机构包括送料装置、加热装置、加压装置、剪切装置等.     

纤维带铺放控制系统的设计研究

设计了一种纤维带铺放头计算机控制系统,可实现铺放头旋转、纤维带铺放、多角度剪切、送卷、收卷、压紧、加热、测带速等功能.分析了控制方案和工艺流程后,采用基于PMAC的开放数控系统解决控制功能的软件实现问题.     

一种发牌机构的虚拟设计与装配方法

介绍了自动洗牌发牌机的结构组成及工作原理;采用SolidWorks三维设计软件,研究了发牌机构零件的虚拟设计方法;借助SolidWorks的三维造型功能,实现了发牌机构零部件的三维建模;充分利用SolidWorks的虚拟装配功能,完成了发牌机构的装配体设计,并进行了干涉分析,以检查零件结构的合理性,缩短了发牌机构的开发周期,为自动洗牌发牌机产品的设计提供了一种可行的方法.     

七自由度碳纤维自动铺放装置结构设计研究

针对我国的纤维铺放技术还处于起步阶段,在对异型件大曲面的铺放研究相对于国外还比较落后,目前还不能实现在数控铺放机上对其进行铺放。设计一种七自由度碳纤维自动铺放装置,采用龙门架结构作为移动机构,设计机械臂作为旋转关节,而辅助机构主要由铺放头承担。之后对铺放设备关键零部件利用SolidWorks Simulation进行静力学分析及模态分析,然后优化设计结构,最后对设备进行运动仿真。验证结果表明符合设计强度要求,能够快速响应动作。设计与仿真结果能够为今后碳纤维自动铺放装置的设计与研究提供一定的参考意义。     

一种组合式数控双端制榫机的设计

为满足实木双榫头加工安全高效、低成本、劳动强度低的需求,设计一种组合式多轴联动的数控双端制榫机,以实现上料、压料、铣削、下料等全自动.首先分析双榫头实木零件结构特点,制订其加工工艺方案;其次根据功能要求和工艺步骤,设计基础机构和相应的功能机构;最后将各机构根据工艺顺序和位置关系进行组合装配.工程实践表明,数控双端制榫机具备单独或同时制榫、可制榫头类型多和尺寸广等功能,是广大家具制造企业生产规模化、提高产能的理想设备.     

纤维缠绕/铺放一体机在大型构件上的应用

纤维缠绕和纤维铺放是复合材料构件的重要成型工艺方法,将两者结合应用于外形复杂的大型构件可以大大提高生产效率和产品质量。简要介绍了纤维缠绕/铺放一体机的总体机构,并对关键机构铺放头进行了描述。     

单向器自动装配机机械结构设计

为了实现某摩托车用单向器自动装配的功能,使装配单向器组件能够实现自动化,研究一种具有自动装配以及检测功能的自动装配设备,提出了单向器自动装配机的设计方案,分析了单向器的关键技术,制定装配机设计技术路线。针对装配机的设计条件,选择关键机构和关键的元器件,设计该装配机的整体结构,确定装配机的控制方案。装配机样机试验结果表明:单向器自动装配机运行良好,运行效率比人工提高了近3倍,自动装配机总体设计方案可行。     

极端高温下风力机叶片的性能分析

随着我国的气候的变化,初步探讨极端天气下风力机叶片的性能变化对提高风力机的可靠性具有一定的指导意义。选取750kW风力机叶片为研究对象,叶片材料选用碳纤维,在ANASYS Workbench中模拟极端高温下风力机叶片性能的变化。研究结果表明:碳纤维叶片极端高温下的等效应力、等效应变和位移和8月份平均最高温度下的相比分别增加了175%、180.7%和125.6%。这一结论将使在以后的叶片设计和生产中,积极考虑极端高温因素的影响。     

小型风力发电机叶片设计与制造的研究

叶片是风力发电机(简称风机)的关键部件,为了制造出优良的小型风机叶片,对小型风机叶片的设计、材料的选择以及模具制造进行了研究。根据当地风能资源的情况,风机的设计功率为300W。首先设计出风轮的基本尺寸,选择NACA4412翼型,经过计算和分析,确定叶片剖面翼型和具体尺寸;其次根据风机叶片的受力情况及其他要求,选择玻璃纤维增强复合材料制作叶片;然后运用CAD和CAM技术,设计了一套小型风机玻璃钢复合材料的叶片并制作了模具。为风机玻璃钢叶片进一步实现规模化生产奠定了良好的基础。     

Integrated aero-structural optimization design of pre-bend wind turbine blades

In the optimization design of a pre-bend wind turbine blade, there is a coupling relationship between blade aerodynamic shape and structural layup. The evaluation index of a wind turbine blade not only shows on conventional ones, such as Annual energy production (AEP), cost, and quality, but also includes the size of the loads on the hub or tower. Hence, the design of pre-bend wind turbine blades is a true multi-objective engineering task. To make the integrative optimization design of the pre-bend blade, new methods for the blade’s pre-bend profile design and structural analysis for the blade sections were presented, under dangerous working conditions, and considering the fundamental control characteristics of the wind turbine, an integrated aerodynamic-structural design technique for pre-bend blades was developed based on the Multi-objective particle swarm optimization algorithm (MOPSO). By using the optimization method, a three-dimensional Pareto-optimal set, which can satisfy different matching requirements from overall design of a wind turbine, was obtained. The most suitable solution was chosen from the Pareto-optimal set and compared with the original 1.5 MW blade. The results show that the optimized blade have better performance in every aspect, which verifies the feasibility of this new method for the design of pre-bend wind turbine blades.

     

风电叶片三维参数建模及振动分析

利用目前风力机叶片设计普遍采用的优化设计方法Wilson设计方法,通过MATLAB编程,开发了小型叶片气动设计的应用程序,并利用该程序设计了一台3kW小型水平轴风力机叶片.采用MATLAB和ANSYS共同建立了风力机叶片三维有限元参数模型,MATLAB编制的建模程序提高了初期设计效率,缩短了ANSYS分析前处理时间.在此基础上进行了叶片固有振动特性计算,分析了叶片的振动特性及其与结构参数之间的关系,分析方法和结果对风电叶片的结构设计和动力分析有一定的参考价值.     

Multi-objective structural optimization of a HAWT composite blade based on ultimate limit state analysis

An extensively automated optimization procedure is presented for a horizontal axis wind turbine (HAWT) blade based on ultimate limit state analysis. Two composite materials named glass fiber reinforced plastic (GFRP) and carbon fiber reinforced plastic (CFRP) are applied with a multi-objective of blade cost and total mass. Laminate layer thickness, material type and orientation angle are tailored for the structural performance and subjected to three design constraints which are derived from analysis of ultimate strength, fatigue failure and critical deflection, respectively. Combining FEM analysis and an evolutionary algorithm, the proposed optimization process has dramatically reduced design cost and improved blade performance.     

Design optimization of wind turbine blades for reduction of airfoil self-noise

To reduce airfoil self-noise from a 10 kW wind turbine, we modified the airfoil shape and planform of a wind turbine blade. To obtain the optimal blade design, we used optimization techniques based on genetic algorithms. The optimized airfoil was first determined based on a section of the rotor blade, and then the optimized blade was designed with this airfoil. The airfoil self-noise from the rotor blades was predicted by using a semi-empirical model. The numerical analysis indicates that the level of the airfoil self-noise from the optimized blade is 2.3 dB lower than that from the baseline blade at the rated wind speed. A wind tunnel experiment was also performed to validate the design optimization. The baseline and optimized rotors were scaled down by a factor of 5.71 for the wind tunnel test. The experimental results showed that airfoil self-noise is reduced by up to 2.6 dB.     

Enhancement of wind turbine aerodynamic performance by a numerical optimization technique

Sectional aerodynamic design optimization was performed to enhance the aerodynamic performance of horizontal axis wind turbine rotor blades based on a computational fluid dynamics technique. The proposed sectional optimization framework consists of airfoil section contour modeling by the PARSEC shape function and a modified feasible direction search algorithm. To enhance the aerodynamic performance of wind turbine rotor blades, the objective of the design framework was set to maximize the lift-over-drag ratio for each design section. A two-dimensional Navier-Stokes flow solver coupled with a transition turbulence model was used to evaluate the aerodynamic performance during the iterative design optimization procedure. The sectional flow conditions were extracted from the flow of a three-dimensional rotor blade configuration. The design framework was applied to the National Renewable Energy Laboratory Phase VI rotor blade. The design optimization was conducted at nine spanwise sections of the rotor blade. To validate the present methodology, the aerodynamic performances of the original baseline rotor and the rotor after the design optimization were compared by using a three-dimensional Navier-Stokes flow solver. It was found that approximately 11% of torque enhancement was achieved after the aerodynamic shape design optimization.     

垂直轴风力发电机叶片气动性能研究

性能优越的垂直轴风力发电机正越来越受到关注。优良的风叶是使垂直风力发电机获得最大风能利用系数和良好经济效益的基础。垂直风力发电机叶型的气动性能研究是当前叶片设计的重要内容。利用ANSYS FLUENT12.0对NACA4412、FX76MP12、DU86-137-25以及C型四种不同叶片的气动性能进行了仿真和分析,得出C型叶片相对其他三种叶片有着更好的气动性能,能为垂直风力发电机叶片的设计起到指导作用。     

大型风力机叶片的耦合优化方法

为了降低兆瓦级风力机叶片的制造成本,通过耦合叶素动量理论与复合材料欧拉伯努利梁强度设计理论,综合考虑风能效率和成本,以叶片的风能效率成本最小化为优化目标,提出了大型风力发电机叶片的多学科优化设计方法。并基于该方法,对某50 m风力机叶片进行了优化设计。研究结果表明,该方法能够找到风能效率与成本的平衡设计点,叶片风能效率成本比传统设计方法设计的叶片减少了8.84%。     

基于钝尾缘翼型叶片的三维风力机性能分析

随着风力机向大型化发展,为有效提升风力机叶片的性能以及结构强度,将钝尾缘翼型应用于风力机叶片设计。以NACA639XX系列翼型为基准翼型,通过Hicks-Henne型函数和钝尾缘函数对翼型进行参数化拟合,使用多岛遗传算法优化得到层流钝尾缘翼型族(USST-XXX)。将此翼型族中相对厚度为21%的USST-211翼型与NACA63921层流翼型替换NREL PhaseVI叶片截面的S809翼型,建模得到两种三维风力机叶片,采用数值模拟的方法,对这两种叶片不同风速下的流场进行分析,并与NREL Phase VI风力机叶片的气动性能进行对比。数值模拟结果表明,在额定风速附近,采用层流钝尾缘翼型所构造的新叶片风力机的风能利用系数高于其他两种叶片。研究结果表明优化得到的层流钝尾缘翼型族可以有效提升风力机气动性能,在大型水平轴风力机叶片设计方面具有良好的应用前景。